Piston-valve.



PATENTED APR. 24, 1906.

B. RICHARDSON. PISTON VALVE.

APPLICATION rum) rmzv. 1905.

ZSHEETS-SHEET l.

was

No. 818,976. PATENTBD APR. 24, 1906. E. RICHARDSON.

PISTON VALVE.

APPLICATION FILED rm. 27. 1905.

2 SHEETS-SHEET 2.

'ment of exhaust and steam ports.

UNITED sTArns PATENT orrron.

PISTON-VALVE.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed February 27,1905. Serial No. 247,610.

To all 7071/0711, it may concern.-

Be it known that I, ENOCH RICHARDSON, j engineer, a subject of the King of Great Britain, residing at 9 Creswick street, in the city of Hawthorn, in the county of Bourke, in the State of Victoria, in the Commonwealth of Australia, have invented certain new and use ful Improvements in Separatelv-Actuated Exhaust Piston-Valves for Steam and other Engines, of which the following is a specilica- 1 tion.

The objects of the invention are as follows:

My invention relates to improvements in valves for steam and other motive engines, and has for its object the construction of a system of three piston-valves working in a cylindrical valve chest. Two of the said valves are keyed on the same rod, their sole use being to control the admission of steam to the cylinder, and are designated the steamvalves. Their position on the valve-rod is so adjusted that the inlet steam-passage from valve-chest to cylinder is direct and short, as shown at P, Figure 1. The third pistonvalve wor s in the same cylindrical valvechest, but is attached to and operated by a separate rod and worked by a separate eccentric. The said third piston-valve works between the two steam-valves and deals with the exhaust-steam only. It is designated the exhaust-valve and is so operated that the steam used in propelling the piston to the end of its stroke is released immediately its work is done through the port I exhaust-passage S, and openings R, Fig. 1.

In order that my invention may be clearly set forth, reference may be had to the accom panying sheets of drawings, in which Fig. 1 is a longitudinal section through main cylinder A and cylindrical valve-chest D on line 1 1 of Fig. 2, showing the arrange- Fig. 2 is a transverse section through main cylinder and cylindrical valve-chest on line 2 2 of Fig. 1, showing the position of steam-inlets M and exhaust-outlet N. Fig. 3 is a longitudinal section of cylindrical valve-chest D, showing the three piston-valves E, E, and G, steampassages O, and inlet M. Fig. 4 is an external plan view of main cylinder A and cy lindrical steam-chest D. Fig. 5 is a front ele vation of the inner steam-valve E; Fig. 6, a front elevation of outer steam-valve E. Fig. 7 is a similar view of the exhaust-valve G.

In constructing a system of valves according to my invention I employ a cylindrical i valve-chest D, attached to main cylinder A, litted with piston B and rod C, as generally used. The said cylindrical valve-chest is provided with a steel cylindrical lining Q, within which the steam-valves E, E, and exhaustvalve G work and through which the con tinuation of steam-ports O and P, Fig. 3, and exhaust-ports E, Fig. 1, are cut. The area of inner steam-valve E being reduced by the f intersection of two rods, it is increased in diameter in order that its area may be the same as the outer steam-valve E, which is without projecting rods. The two steam-valves E and E are worked by the same rod F, to which both are keyed. The said rod works in the gland f. The exhaust-valve G is operated by a separate rod H, to which it is attached, as shown in Fig. 1. The said rod passes through the inner steam-valve E and works within a sleeve J. with stufling-box K, prevents the escape of exhaust-steam from the middle portion of cylindrical valve-chest D through the steamvalve E, to which the said sleeve is attached. It works through the gland h. The steamvalves E E and exhaust-valve G are formed by the use of two disks recessed on the pe riphery and fitted with cut rings of the form shown in Fig. 1. The exhaust-valve seat I is formed in the steel lining Q by cutting out two circular openings R, intersected by crossbars, as shown in Fig. 1.

The steam-valves E and E are worked by the ordinary eccentrics. The exhaust-valve G is worked by a single movable eccentric. As these eccentrics are of the ordinary kind and form 110 part of the invention, they are not shown in the drawings.

The manner of working is as follows: The piston B being placed at the end of its stroke, as shown in Fig. 1, steam is admitted from the cylindrical steamchest D through the port P to cylinder A between the piston-head and outer-cylinder cover. As the piston moves backward the piston-valves E and E are simultaneously moved in the same direction until the action of the eccentrics reverses the motion of said pistonvalves, when the supply of steam is cut off by valve E at such point as may have been determined. IVhile the piston B is moving backward, as above described, the exhaust-valve G is brought to the end of its stroke by the action of its eccentric, its motion being then reversed, so that by the time the piston reaches the inner end of cylinder A the exhaust-port R is open for The gland L,

ear.

the release of steam, the eccentric working the said exhaust-valve G being then almost at its maximum throw. The eccentric working the exhaust-valve G may be so set that shortly before the piston B reaches the end of its stroke the exhaust-port P vis open to the extent shown at B, Fig. 1.

I do not comprise in my invention any particular form of eccentrics for working the steam-valves E and E nor of the exhausteccentric V for working the exhaust-valve G.

Having now described my invention, what I claim as new, and desire to secure byLetters Patent, is

In combination with a cylinder and its 'piston, a steam-chest of varying interior diameters having inlet and exhaust ports to the cylinder, piston-valves E E located at each end of the steam-chest, and controlling the inletports, a piston-valve G located between the valves E E and controlling the exhaust-port,

the valve E being of smaller diameter than pistons E and G, means for moving the valves E E in unison said means comprising a rod passing through the three valves, valves E and E being rigidly secured to said rod and valve G having movement thereon, a sleeve J connected to the valve E and extending through the steam-chest, a packing-box at the outer end of said sleeve, a rod connected to the exhaust-valve G and extending through the valve E and the sleeve J and its packingbox and means for reciprocating said rod so as to move the valve G independently of the valves E E.

In witness whereof I have hereunto set my hand in presenceof two Witnesses.

ENOCH RICHARDSON.

Witnesses:

WILLIAM HENRY CUBLEY, WILLIAM OO'NYERS 

